<template>
  <div class="barcode">
    <div v-if="barcode">
      <canvas :id="id" class="barcode"></canvas>
    </div>
  </div>
</template>
<script>
import JsBarcode from "jsbarcode";
let unique = 0;

export default {
  props: {
    dataType: {
      type: String,
      default: "static",
    },
    format: {
      type: String,
      default: "code128",
    },
    lineColor: {
      type: String,
      default: "#000",
    },
    background: {
      type: String,
      default: "#fff",
    },
    relationField: {
      type: String,
      default: "",
    },
    formData: {
      type: Object,
    },
    width: {
      type: Number,
      default: 4,
    },
    height: {
      type: Number,
      default: 40,
    },
    staticText: {
      type: String,
      default: "",
    },
  },
  computed: {
    barcode() {
      if (this.dataType === "static") {
        return this.staticText;
      } else {
        return this.relationText;
      }
    },
  },
  data() {
    return {
      id: "",
      relationText: "",
    };
  },
  created() {
    this.id = this.uuid();
  },
  watch: {
    formData: {
      handler: function (val) {
        if (val && this.dataType === "relation" && this.relationField) {
          this.relationText = val[this.relationField];
        }
      },
      deep: true,
      immediate: true,
    },
    format() {
      this.getBarcode();
    },
    barcode() {
      this.$nextTick(() => {
        this.getBarcode();
      });
    },
    lineColor() {
      this.getBarcode();
    },
    background() {
      this.getBarcode();
    },
    width() {
      this.getBarcode();
    },
    height() {
      this.getBarcode();
    },
  },
  mounted() {
    this.getBarcode();
  },
  methods: {
    uuid() {
      const time = Date.now();
      const random = Math.floor(Math.random() * 1000000000);
      unique++;
      return "barcode_" + random + unique + String(time);
    },
    getBarcode() {
      if (!this.barcode) return;
      let reg = /^[A-Za-z0-9]+$/;
      if (!reg.test(this.barcode)) {
        return;
      }
      JsBarcode("#" + this.id, this.barcode, {
        format: this.format,
        lineColor: this.lineColor,
        width: this.width,
        height: this.height,
        background: this.background,
        displayValue: false,
        margin: 5,
      });
    },
  },
};
</script>
<style lang="scss" scoped>
.barcode {
  width: 100%;
  padding: 0;
  overflow: hidden;
  min-height: 40px;
}
</style>
